CVE-2022-50770: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-50770 is a memory leak vulnerability in the Linux kernel's OCFS2 (Oracle Cluster File System 2) subsystem, specifically within the ocfs2_mount_volume() function. The flaw was identified via kmemleak tooling and disclosed on December 24, 2025. It affects the Linux kernel across multiple stable branches. The CVSS category is estimated as Medium, with an EPSS score of 0.000240 (Feedly).

The root cause is a memory leak (CWE-401: Missing Release of Memory after Effective Lifetime) in the OCFS2 filesystem driver. During ocfs2_mount_volume(), the function ocfs2_compute_replay_slots() allocates memory via __kmalloc to track online/offline slots for the replay_map structure. Under certain error paths — specifically when ocfs2_check_volume() fails after the allocation — the allocated memory is not freed before the function returns, resulting in a kernel memory leak. The leak is triggered during the mounting of an OCFS2 volume and was confirmed via kmemleak backtrace showing the mount.ocfs2 process as the originator (Feedly). Fixes were committed to multiple stable kernel trees (commits 2b7e59ed, 4efe1d2d, 7ef51688, 50ab0ca3, 8059e200).

The primary impact is a kernel memory leak, which degrades system availability over time by exhausting kernel memory resources on systems that repeatedly mount OCFS2 volumes. This can lead to degraded performance or system instability on affected Linux hosts using the OCFS2 filesystem. There is no known confidentiality or integrity impact, and the vulnerability does not enable privilege escalation or remote code execution (Feedly).

Apply the upstream Linux kernel patches that fix the memory leak in ocfs2_mount_volume(). The fixes have been committed to multiple stable kernel branches (commits 2b7e59ed2e77, 4efe1d2db731, 7ef516888c4d, 50ab0ca3aff4, 8059e200259e). Distributions such as SUSE have issued kernel security updates addressing this CVE (e.g., SUSE advisories SUSE-2026-0263-1, SUSE-2026-0317-1, SUSE-2026-0411-1). Users should update to a patched kernel version provided by their Linux distribution. As a workaround, avoiding repeated mounting/unmounting of OCFS2 volumes on long-running systems can reduce the rate of memory exhaustion (Feedly, Linux Security).